Unit 4 · Turning Effect of Forces
15 randomly selected questions from a bank of 60 · one attempt · 15 minutes on the clock.
Student Learning Outcomes covered
- Define like and unlike parallel forces; state the head-to-tail rule of vector addition
- Describe how a force is resolved into perpendicular components, and find magnitude/direction from those components
- Define moment of force (torque) = perpendicular distance from pivot × force; relate it to everyday life
- Illustrate moment of force in bottle openers, spanners, and door/window handles
- State and verify the principle of moments using a metre rod balanced on a wedge
- Define centre of mass and centre of gravity; determine their position for regular and irregular objects
- Define a couple; prove it has the same moment about all points; relate it to steering wheels and bicycle pedals
- Define equilibrium, classify its types, and state the two conditions for equilibrium of a body
- Solve problems on simple balanced systems supported by one pivot
- Describe the states of equilibrium and how centre of mass position affects stability
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